I simply picked up my reel of double-sided tape & drew around the inside of it 3 times moving the reel without thinking before drawing the portion of the circle that fell within the area of my 'tile'. When I looked at the result I immediately thought 'Auraknot' so that was my first tangle. The remaining tangles were chosen by throwing my Icosahedron dice & using the tangles corresponding to each number on a list I compiled whilst working through the MCC Zentangle course last year.